package chapter4.Example17;
class Animal{
    public void shout(){
        System.out.println("动物叫");
    }
}
class Dog extends Animal {
    public void shout() {
        System.out.println("汪汪汪.....");
    }

    public void eat() {
        System.out.println("吃骨头....");
    }
}
public class Example17 {
    public static void main(String[] args) {
        Animal a1=new Dog();
        System.out.println("Animal a1=new Dog():"+(a1 instanceof Animal));
        System.out.println("Animal a1=new Dog():"+(a1 instanceof Dog));
        Animal a2=new Dog();
        System.out.println("Animal a2=new Dog():"+(a2 instanceof Animal));
        System.out.println("Animal a2=new Dog():"+(a2 instanceof Dog));

    }
}
